Casual Carpool offers a (usually) one way trip from the East Bay to San Francisco ( Fremont/Mission and nearby) in the morning. You usually get back by yourself on transit in the evening or if you are lucky you can catch a ride back.

It is 'casual' : you simply wait at a designated area and get picked up.

How does it work?

You get picked up by someone driving by.

Be polite and don't eat or drink in the car.

Let drivers start the chatter: they may prefer to focus on driving

If you are in a car that has to pay a toll (like it's past commute time arriving at the toll gate) passengers should pay more than fair share to encourage the driver to continue picking up passengers.

Use common sense: if you don't feel comfortable getting a ride with someone, let someone else go. Three to a car is safest for passengers and driver, though two people is enough for a two seat car.